NEW FEATURES:
- batch_mode mode
- bumped to version 0.8.6
- change copyright date to 2013
- gotten rid of $Id$ and $Log$ in headers

BUG FIXES:
- some number adjusted for a better/more reliable fit in yfwhm()
- big bugfix in decimal_time() when dealing with negative hour when
  hour is zero (e.g. -00:15:01)